Molecular basis of carbon dioxide transport in polycarbonate membranes

Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 112, Issue: 14, Page: 4253-4260
2008
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Metrics Details

  • Citations
    16
    • Citation Indexes
      16
  • Captures
    9

Article Description

Gas transport of carbon dioxide in poly[bisphenol A carbonate-co-4, 4′-(3,3,5-trimethylcyclohexylidene)diphenol carbonate] films over a wide range of pressure is described. The interpretation of the experimental results in terms of the dual mode model allowed the evaluation of the parameters of the model that govern the gas permeation process. The value of the diffusion coefficient obtained for carbon dioxide at zero concentration was 2.4 × 10 cm s at 303 K. This parameter was also measured by using pulsed field gradient NMR finding that its value reaches a nearly constant value of (2.7 ± 0.9) × 10 cm s, at 298 K, for diffusion times greater than 20 ms. Both the diffusion and solubility coefficients were also computed by using simulation methods based on the transition states theory and the Widom method, respectively. The value obtained for the diffusion coefficient was 1.8 × 10 cm s, at 303 K, which compares very favorably with the experimental measurements. The drop of the simulated solubility coefficient with increasing pressure is sharper than that of the experimental one, at low pressures, and similar, at high pressures. © 2008 American Chemical Society.

Bibliographic Details

Garrido, Leoncio; López-Gonzalez, Mar; Saiz, Enrique; Riande, Evaristo

American Chemical Society (ACS)

Chemistry; Materials Science

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